{
  "abstract": "We investigate massive scalar perturbations and several characteristics of particle motion in the spacetime of regular black holes arising in four-dimensional quasi-topological gravity. Quasinormal modes are computed using high-order WKB approximations with Padé resummation and verified through time-domain integration. For moderate values of the scalar-field mass, the time-domain profiles confirm the WKB results with excellent accuracy. As the mass increases, the damping rate decreases substantially, indicating the approach to the quasi-resonant regime of long-lived modes. For sufficiently large masses, the late-time signal becomes dominated by oscillatory power-law tails, which mask the quasi-resonant mode in the time-domain profile. In addition, we analyze photon motion and circular geodesics, including the photon-sphere radius, shadow size, Lyapunov exponent, and ISCO characteristics. These quantities exhibit only moderate deviations from their Schwarzschild values, unlike the Hawking temperature of the black hole.",
  "abstract_shown": true,
  "affiliations": [
    "University of Hradec Králové"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Bekir Can Lütfüoğlu",
      "orcid": "0000-0001-6467-5005"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6v4pkg4vs6k2g.bib",
  "cited_by": 15,
  "doi": "10.1140/epjc/s10052-026-15807-9",
  "fulltext_url": null,
  "id": "6v4pkg4vs6k2g",
  "issns": [
    "1434-6044",
    "1434-6052"
  ],
  "landing_url": "https://doi.org/10.1140/epjc/s10052-026-15807-9",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
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  "openalex": "W7161131547",
  "pdf_url": "https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15807-9.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-05-14",
  "publisher": "Springer Science+Business Media",
  "ris": "https://research.draconitic.com/paper/6v4pkg4vs6k2g.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:18Z",
      "native_id": "W7161131547",
      "source": "openalex",
      "url": "https://doi.org/10.1140/epjc/s10052-026-15807-9"
    }
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  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Black Holes and Theoretical Physics",
      "subfield": "high-energy"
    }
  ],
  "title": "Long-lived quasinormal modes, shadows and particle motion in four-dimensional quasi-topological gravity",
  "title_text": "Long-lived quasinormal modes, shadows and particle motion in four-dimensional quasi-topological gravity",
  "type": "peer-reviewed",
  "updated_at": "2026-11-04T13:21:01Z",
  "url": "https://research.draconitic.com/paper/6v4pkg4vs6k2g",
  "venue": "The European Physical Journal C",
  "versions": []
}